I Just bought a barely used '01 426 from a local car dealer that took it in on trade. Stole it for $2500.00!!! Long story short, rode it twice (after full service) and it locked up the crank bearing. Took the bottom end to my favorite mechanic, cylinder to machinist for light honing and parts are on order, should have it up and running again by Saturday (which will give me time to tear apart my freshly seized '01 RM250...some guys have all the luck!) So, while I have some down time with both bike's motors in the shop, I have some basic 426 questions. Any help will be greatly appreciated! 1. How many miles will a stock tank get you on fast open western desert terrain? 2. What is the best spark arrestor for "Blue Thunder", and does anyone make a replacement spark arrestor that just replaces the tip of the stock unit? 3. What are the "BK carb" and Blue wire" mods I keep hearing about? 4. Desert racers.....what gearing seems to work on this thing......I rode it with 14/48 and it felt alot slower than my 250 with only a few teeth smaller in the back. 15/46 maybe? And if so, does it pull something that high decently in the tight stuff or will I be replacing the clutch every race? Can't figure out if it is actaully slower or just feels that way because I am not used to the 4 stroke power and and it's low rumble. Seemed like I was "shifting for 6th gear" alot in the fast stuff! 5. Should I be atleast mixing some race gas (I like Vp C-12) with 92 octane pump gas or is the 92 adequate for the thumper. 12.5:1 seems a little steep for straight pump gas to me! 6. I have been told that 3rd, 4th and 5th gear out of a WR will fit right into the tranny of the YZ to make it more desert racing friendly. Anybody done this mod? 7. What do I have to do to trick myself into thinking this thing is not heavy! Feels like my RM with a tank full of lead in it. Not bad on straights and great in the rocks, but man, in the technical sections I feel like I am on an XR650 or something. Guess it's hard to go back and forth between it and my 250 without always being reminded that it really ways 248 lbs no matter what Yamaha says it's dry weight is. Again, any help would be highly appreciated, as this is my first thumper.